JPH11250785A - Puffer type gas-blast circuit breaker with closing resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase electrical and mechanical reliability and to miniaturize the whole breaker. SOLUTION: In this gas-blast circuit breaker, an aperture 51 is formed in an insulating tube 50 for insulating and supporting a movable part 7 and a fixed part 6 of an arc extinguishing chamber, and an arm part 40 coupling the movable part 7 with a closing resistance contact movable electrode 23 can move from side to side in the switching motion of the gas breaker. The shape of the aperture 51 is extended to a portion connected with one end of the insulating tube 50, i.e., fixing fulcrum 11 of the fixed part 6. At the same time, an insulating tube mounting part 60 of the fixing fulcrum 11 mounted with the insulating tube 50 is provided with a notch 61 in the position facing to a closing resistance contact fixing part 24 in conformity with the shape of an arc extinguishing chamber fixed side mounting part of the insulating tube 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker with a closing resistance, and more particularly to a puffer type gas circuit breaker with a single-point closing resistance.

[0002]

2. Description of the Related Art With the increase in capacity of power transmission systems, circuit breakers used in substations and switchyards are required to have increased breaking capacity and high reliability. As described above, in order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, in recent years, the number of break points of the circuit breaker has been reduced, and a conventionally used 550 kV double-break circuit breaker has been replaced with a single break circuit breaker.

In a circuit breaker for a large-capacity system such as a 550 kV class, a closing resistance method is employed in order to suppress a closing overvoltage at closing.
In this closing resistance method, a closing resistance contact having a closing resistance is provided in parallel with a main contact of the circuit breaker. When the closing resistance contact is closed, the closing resistance is suppressed by the closing resistance, and in this state, the breaker is closed. Is turned on. In this closing resistance method, it is necessary that the closing resistance contact is first opened at the time of interruption, and then the main contact is opened.

FIG. 17 is a sectional view showing the structure of a two-point puffer type gas circuit breaker provided with the above-mentioned closing resistance contact. That is, as shown in FIG. 17, in the conventional puffer-type gas circuit breaker, two cut-off portions 2 are arranged symmetrically in a horizontally arranged container 1 in which an insulating gas is sealed, and are located at a central portion. They are connected in series via the support member 3. Each of the two interrupting sections 2 includes an arc-extinguishing chamber 4 and a closing resistance contact section 5, respectively. Since these two blocking portions 2 have the same configuration, FIG.
In FIG. 7, the other blocking unit 2 is omitted.

Subsequently, the arc-extinguishing chamber 4 constituting the interrupting section 2
And the closing resistance contact section 5 will be described. That is, the arc-extinguishing chamber 4 includes the fixed part 6 and the movable part 7 which are arranged to face each other in the horizontal direction. The fixed portion 6 includes a fixed finger 8, a fixed arc electrode 9, a shield 10 on the fixed side, and a fixed support 11 made of a conductive material for supporting these.
Are integrally fixed. Also, the movable part 7
Is configured such that a movable electrode 12, a movable arc electrode 13, an insulating nozzle 14, an operation rod 15, and a puffer cylinder 16 made of a conductive material are integrally fixed.

On the other hand, in order to support the movable part 7, a supporting insulating cylinder 17 and a supporting insulating cylinder shield 18 are provided on the flange portion 1a of the container 1.
At both ends, a movable support 19 is provided, and the movable support 7 supports the movable portion 7. Further, a puffer cylinder 16 and a puffer piston 20 forming a compression chamber are fixed to the movable support 19. Further, the fixed portion 6 is fixed to the movable support 19 via an insulating cylinder 21, and is supported by the movable support 19. The insulating cylinder 21 may be an insulating rod or a capacitor.

Next, the closing resistance contact section 5 includes a closing resistance contact fixing section 22 and a closing resistance contact movable electrode 23 which are arranged to face each other.
It has. Of these, the closing resistance contact fixing section 22 is
It is fixed to the fixed support 11 via the insulating member 24 and the connecting member 35. In addition, the closing resistance contact fixing section 22 includes:
A closing resistance contact fixed electrode 25 and a spring 26 movably supporting the closing resistance contact fixed electrode 25 are provided.

In the open state, the spring 2
The configuration is such that the application resistance 6 is used to hold the application resistance contact fixed electrode 25 so as to protrude toward the application resistance contact movable electrode 23 side. Further, the closing resistance contact movable electrode 23 is mechanically fixed to an arm portion 40 which extends a flange portion of the movable electrode 12 downward in the drawing, and is electrically connected.

In this case, the closing resistance contact fixing section 22
The spring 26 is selected such that its restoration speed is lower than the moving speed of the closing resistance contact movable electrode 23. The closing resistance contact portion 5 and the arc-extinguishing chamber 4 are connected to each other by the electrode of the closing resistance contact portion 5. The configuration is such that the electrode wipe in the arc-extinguishing chamber 4 is larger than the wipe. That is, as described above, when the circuit breaker is closed, the closing resistance contact portion 5 is closed first, and thereafter, the arc-extinguishing chamber 4 as the main contact is closed. On the other hand, at the time of interruption, even if the closing resistance contact movable electrode 23 moves at the same speed as the movable portion 7 of the arc-extinguishing chamber 4,
The closing resistance contact section 5 is opened first, and then the arc-extinguishing chamber 4 as the main contact is opened.

A closing resistor 27 is disposed on the back of the breaking section 2 and has one end mechanically fixed to the closing resistor contact fixing section 22 at one end and electrically connected in series. Further, the closing resistor 27 is mechanically fixed to the fixed support 11 via a conductor 28 at the other end and is electrically connected thereto. Therefore,
The closing resistor 27 is mechanically supported together with the fixed part 6 via the insulating cylinder 21 supported by the movable support 19.

The operating rod 1 of the movable part 7 of the arc-extinguishing chamber 4
A drive source (not shown) in a mechanism box 30 disposed below the container 1 is connected to 5 via an insulating operation rod 29 disposed in a vertical direction. And this mechanism box 3
When the insulated operation rod 29 is operated in the vertical direction in the figure by a drive source within the range of 0 in FIG.
The operation rods 15 of the blocking portions 2 arranged on both sides of the moving portions 7 horizontally move in opposite directions to each other, and the movable portions 7 of the respective blocking portions 2
And the closing resistance contact movable electrode 23 is configured to operate integrally.

More specifically, the operating rod 15 is slidable with respect to the puffer piston 20 and the movable support 19 by sliding members 31 and 32 provided on the inner surfaces of the puffer piston 20 and the movable support 19. It is configured. The operating rod 15 is connected to the insulating operating rod 29 via a link 33 and a lever 34. With this configuration, the driving force of the insulating operating rod 29 in the vertical direction is converted to the horizontal direction, and the operating rod 15 It is transmitted to. Further, the mechanism box 30 is fixed to the flange portion 1a of the container 1, and the flange portion 1a and the supporting insulating cylinder 1 are fixed.
7, the whole of the two blocking portions 2 is supported.

[0013]

When the two-pointer puffer type gas circuit breaker constructed as described above is cut into one point, as shown in FIG. Become. As a result, the support member 3 connecting the two shut-off portions in the two-point cut puffer type gas circuit breaker becomes unnecessary, so that the movable support 19 is fixed to the partition wall 30a provided between the movable support 19 and the mechanism box 30. Support insulating cylinder 17
Is directly fixed via a supporting insulating cylinder shield 18.

Further, since it is not necessary to change the transmission direction of the driving force into two directions, the operation rod 15
The insulating operation rod 29 and the mechanism box 30 are sequentially connected, and the driving force from the mechanism box 30 is transmitted to the operation rod 15 in a linear direction. Then, with the arrangement of the mechanism box 30, the support insulating cylinder 17 is fixed to a partition wall 30a between the mechanism box 30 and the container 1, and the mechanism box 30 supports the entire blocking unit 2 via the support insulating cylinder 17. It is configured to be.

As described above, when the two-point puffer type gas circuit breaker is cut into one point, the cut-off section 2 including the arc-extinguishing chamber 4 and the closing resistance contact section 5 has two to one component members. The configuration and operation are basically as shown in FIG.
7 is the same as the shutoff section 2 of the puffer type gas circuit breaker shown in FIG.

However, the voltage applied to the insulating member 24 for supporting and fixing the closing resistance contact fixing portion 22 to the fixing support 11 is doubled by dividing the two-point cutting into one point. Therefore, in the single-pointer puffer type gas circuit breaker, it is necessary to make the dielectric strength of the insulating member 24 twice that of the two-pointer puffer type gas circuit breaker.

The fixing unit 6 and the closing resistance contact fixing unit 22
Similarly, the dielectric strength of the gas gap between them also needs to be doubled. That is, as shown in FIG. 19, the size of the gas gap G between the fixing portion 6 and the closing resistance contact fixing portion 22 must be increased, so that the overall length of the insulating member 24 must be increased. As a result, the distance L between the centers of the arc-extinguishing chamber fixing portion 6 and the closing resistance contact fixing portion 22 increases.

FIG. 19 is a view of the fixed part 6 and the closing resistance contact fixed part 22 as viewed from the side of the movable part 7 of the arc-extinguishing chamber. FIG. 20 shows the structure of the insulating cylinder 21. An arm 40 connecting the movable part 7 and the closing resistance contact movable electrode 23 is provided below the center of the insulating cylinder 21 to open and close the gas circuit breaker. A hole 41 is provided so that it can sometimes move in the left-right direction in the figure.

Further, as the distance L between the center of the arc-extinguishing chamber fixing portion 6 and the closing resistance contact fixing portion 22 increases, the arm portion 4 connecting the closing resistance contact movable electrode 23 to the movable electrode 12.
Since the length of 0 is also longer than that in the case of two-point cutting, when the closing resistance of the gas circuit breaker causes the closing resistance contact movable electrode 23 to collide with the closing resistance contact fixed electrode 25, it is generated at the base of the arm part 40. Bending stress may increase. On the other hand, when the gas circuit breaker is opened, the bending stress generated by the inertial force when the gas circuit breaker starts and stops may increase, so it is necessary to strengthen the strength of the arm portion 40.

An insulating member 24 for insulatingly supporting the closing resistance contact fixing portion 22 on the fixing portion 6 of the arc-extinguishing chamber is a conventional one shown in FIG.
As shown in the figure, the arc-extinguishing chamber 4 is arranged at right angles to the longitudinal direction. Therefore, when the closing resistance of the gas circuit breaker causes the closing resistance contact movable electrode 23 to collide with the closing resistance contact fixed electrode 25, a bending load is also generated on the insulating member 24. In particular, in the case of one-point cutting, as described above, it is necessary to increase the overall length of the insulating member 24, so that the moment arm becomes longer, and the bending load increases. was there.

As described above, when the two-point cut puffer type gas circuit breaker is cut into one point for the purpose of reducing the size of the gas circuit breaker, the arc extinguishing chamber 4 is halved, and the two-point cut puffer type gas cutoff is used. Since the support member 3, the link 33, the lever 34, and the like, which were required in the case of the container, can be omitted, the number of components in the container 1 can be greatly reduced. Further, the longitudinal dimension of the container 1 itself can be significantly reduced.

However, when the two-point puffer type gas circuit breaker is cut into one point, as described above, the insulating member 24 for insulatingly supporting and fixing the closing resistance contact fixing portion 22 to the fixing support 11, and the fixing of the arc-extinguishing chamber. Section 6 and closing resistance contact fixing section 2
Since it is necessary to strengthen the insulation of the gas gap between the two, there has been a problem that the inner diameter of the container 1 must be larger than the inner diameter of the two-pointer puffer type gas circuit breaker.

Further, when the gas circuit breaker is closed, the mechanical reliability of the arm portion 40 and the insulating member 24 is caused by a bending load generated when the closing resistance contact movable electrode 23 and the closing resistance contact fixed electrode 25 collide with each other. Therefore, there is a problem that each member must be enlarged in order to enhance the mechanical strength.

The present invention has been proposed in order to solve the problems of the prior art as described above.
An object of the present invention is to provide a puffer-type gas circuit breaker with a closing resistance, which has high electrical and mechanical reliability and enables a reduction in the size of the circuit breaker as a whole, in particular, a reduction in the inner diameter of the container.

[0025]

In order to achieve the above object, an invention according to claim 1 is provided in an arc-extinguishing chamber housed in a container filled with an insulating gas and insulated and supported by the container. And a closing resistor electrically connected in parallel with the arc-extinguishing chamber to suppress an overvoltage at closing, and a closing resistance contact portion electrically connected in series with the closing resistor. Is composed of an arc-extinguishing chamber fixed section and an arc-extinguishing chamber movable section, and these arc-extinguishing chamber fixing section and arc-extinguishing chamber movable section are supported by an insulating cylinder,
In a puffer type gas circuit breaker with a closing resistance, wherein the closing resistance contact portion is insulated and supported in the arc-extinguishing chamber via an insulating member, the insulating cylinder has one end on a side where the closing resistance contact portion is provided. A hole is formed in the arc-extinguishing chamber fixing portion to which the insulating tube is fixed, and the insulating tube mounting portion of the arc-extinguishing chamber fixing portion is configured to conform to the shape of the end of the insulating tube. Things.

According to the first aspect of the present invention, the insulation distance between the arc-extinguishing chamber fixing portion and the closing resistance contact fixing portion is conventionally determined by the insulating cylinder attached to the arc-extinguishing chamber fixing portion. The space secured from the lower end was cut out so that the insulating cylinder mounting part of the arc quenching chamber fixing part conformed to the shape of the end of the insulating cylinder. The resistance contact portion can be arranged close to the arc-extinguishing chamber fixing portion. As a result, the inner diameter of the container can be reduced, so that the entire circuit breaker can be downsized.

According to a second aspect of the present invention, in the puffer type gas circuit breaker with a closing resistor according to the first embodiment, the insulating tube has a hole extending to both ends on the side where the closing resistor contact portion is provided. It is characterized by having been done. According to the second aspect of the present invention having the above configuration, in addition to the operation and effect of the first aspect, the shape of the insulating cylinder can be simplified.

According to a third aspect of the present invention, in the puffer type gas circuit breaker with the closing resistance according to the first or second aspect, the arc quenching chamber fixing portion conforms to the shape of the end of the insulating cylinder. It is characterized by being constituted so that. According to the third aspect of the invention having the above configuration, the insulating cylinder mounting portion of the arc extinguishing chamber fixing portion is cut so as to conform to the end shape of the insulating cylinder as described in the first aspect. In addition to the chipping, the fixed side shield, fixed finger, and fixed arc electrode that make up the arc-extinguishing chamber fixed part are also cut out to match the end shape of the insulating cylinder, ensuring the required insulation distance In addition, it is possible to dispose the closing resistance contact portion closer to the arc-extinguishing chamber fixing portion. As a result, the inner diameter of the container can be further reduced, so that the overall size of the circuit breaker can be further reduced.

According to a fourth aspect of the present invention, in the puffer type gas circuit breaker with the closing resistor according to any one of the first to third aspects, the closing resistor contact portion is supported by the arc-extinguishing chamber fixing portion. The insulating member is arranged in parallel with the longitudinal direction of the arc-extinguishing chamber. According to the invention as set forth in claim 4 having the above configuration, the insulating member that insulates and supports the closing resistance contact portion on the arc-extinguishing chamber fixing portion is arranged in parallel to the longitudinal direction of the arc-extinguishing chamber. Since the space in the container can be effectively used and the inner diameter of the container can be further reduced, the overall size of the circuit breaker can be further reduced.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (hereinafter, referred to as an embodiment) of a puffer type gas circuit breaker with a closing resistor according to the present invention will be specifically described below with reference to FIGS.
The same members as those of the conventional type shown in FIGS. 17 to 20 are denoted by the same reference numerals, and description thereof will be omitted.

[1. First Embodiment] In this embodiment, an insulating cylinder 50 that insulates and supports a movable part 7 and a fixed part 6 of an arc-extinguishing chamber is provided.
The structure of the insulating cylinder mounting portion of the fixing support 11 of the fixing portion 6 is improved. That is, as shown in FIG. 1, a hole 51 is formed in the insulating cylinder 50 that insulates and supports the movable part 7 and the fixed part 6 of the arc-extinguishing chamber, and when the gas circuit breaker is opened and closed, the movable part 7 is closed. The arm 40 connecting the resistance contact movable electrode 23 is configured to be able to move in the left-right direction in the figure. The shape of the hole 51 is, as shown in FIG. 2, one end of the insulating tube 50, that is, the fixing portion 6.
The structure is extended to a portion connected to the fixed support 11 (see FIG. 20).

On the other hand, as shown in FIG. 3, the insulating cylinder mounting portion 60 of the fixed support 11 to which the insulating cylinder 50 is mounted is
A notch 61 is formed in a portion facing the closing resistance contact fixing portion 22 according to the shape of the arc-extinguishing chamber fixing side mounting portion of the insulating cylinder 50.

In the present embodiment having the above-described configuration, the part of the insulating cylinder 50 attached to the arc-extinguishing chamber fixing part 6 is partially omitted, so that the insulating cylinder mounting part 60 of the fixing support 11 is removed.
A notch 61 can be formed in a portion facing the closing resistance contact fixing portion 22 of the first embodiment. As a result, as shown in FIG. 3, while maintaining the insulation distance G between the closing resistance contact fixing part 22 and the arc-extinguishing chamber fixing part 6, the distance between the center of the closing resistance contact fixing part 22 and the arc-extinguishing chamber fixing part 6 is maintained. Since the distance L1 can be reduced as compared with the related art, the inner diameter of the container 1 can be reduced.

Further, as the center distance L1 between the closing resistance contact fixing portion 22 and the arc-extinguishing chamber fixing portion 6 is reduced as compared with the prior art, the length of the arm portion 40 can also be shortened. Thereby, when closing the gas circuit breaker, the bending stress generated at the base of the arm portion 40 can be reduced when the closing resistance contact movable electrode collides with the closing resistance contact fixed electrode, and
At the time of opening, the bending stress generated by the inertial force at the time of starting and stopping can be reduced, so that the mechanical reliability of the circuit breaker can be improved.

[2. Second Embodiment] In the present embodiment, the configuration of the insulating cylinder 50 shown in the first embodiment is further improved. That is, as shown in FIG. 4, a hole 71 is formed in the insulating cylinder 70 that insulates and supports the movable part 7 and the fixed part 6 of the arc-extinguishing chamber, and when the gas circuit breaker is opened and closed, the movable part 7 is closed. Arm 4 for connecting movable electrode 23 with resistance contact
0 is movable in the left-right direction in the figure. Further, as shown in FIG.
The insulating cylinder 70 is formed so as to form a horseshoe shape.

The mounting structure of the arc-extinguishing chamber fixing portion 6 and the closing resistance contact fixing portion 22 in this embodiment is the same as that in the first embodiment. Further, the configuration of the connecting portion between the movable portion 7 of the arc-extinguishing chamber and the insulating cylinder 70 may be partially cut away like the mounting portion 60 of the fixed support 11 of the first embodiment, or may not be particularly cut. May be either.

In the present embodiment having the above-described configuration, the shape and shape of the insulating cylinder 70 can be simplified in addition to the same operations and effects as in the first embodiment.

[3. Third Embodiment] This embodiment is a modification of the above-described first embodiment, in which the configuration of the fixed portion of the arc-extinguishing chamber is improved. Note that the insulating cylinder is configured in the same manner as in the first embodiment. In the present embodiment, as shown in FIGS. 6 and 7, a part of the fixing portion 6 of the arc-extinguishing chamber is cut off. That is, the first
As in the embodiment, the insulating cylinder mounting portion 60 of the fixed support 11 is provided.
According to the shape of the arc-extinguishing chamber fixed-side mounting portion of the insulating cylinder 50, a notch 61 is formed at a portion facing the closing resistance contact fixing portion 22.

Further, the fixed support 11 formed in a cylindrical shape
Similarly, the portion of the cylindrical portion facing the closing resistance contact fixing portion 22 is also notched. Further, the fixed resistor 8 and the closing resistance contact fixing portion 2 of the fixed side shield 10
The portion facing 2 is also notched. In the present embodiment, the insulating cylinder has the same configuration as in the first embodiment, but it goes without saying that the insulating cylinder may have the same configuration as in the second embodiment.

In the present embodiment having the above-described configuration, the insulation distance between the closing resistance contact portion 22 and the arc-extinguishing chamber fixing portion 6 is improved by improving the configuration of the arc-extinguishing chamber fixing portion 6. It is possible to further reduce the center distance L2 between the closing resistance contact fixing section 22 and the arc-extinguishing chamber fixing section 6 while maintaining G.

Further, as the center distance L2 between the closing resistance contact fixing portion 22 and the arc-extinguishing chamber fixing portion 6 is further reduced, the length of the arm portion 40 can be further reduced. Thereby, when closing the gas circuit breaker, when the closing resistance contact movable electrode collides with the closing resistance contact fixed electrode, it is possible to further reduce the bending stress generated at the root of the arm portion 40,
Further, at the time of opening, the bending stress generated by the inertial force at the time of starting and stopping can be further reduced, so that the mechanical reliability of the circuit breaker can be further improved.

[4. Fourth Embodiment] In the present embodiment, the arrangement of an insulating member for insulatingly supporting the closing resistance contact fixing portion 22 on the fixing portion 6 of the arc-extinguishing chamber is improved. In addition,
The insulating cylinder is configured similarly to the conventional type shown in FIGS. 18 and 20. In the present embodiment, as shown in FIG. 8, the closing resistance contact fixing portion 22 is insulated and supported by the fixing portion 6 of the arc-extinguishing chamber via an insulating member 80. That is, the insulating member 80 is disposed in parallel to the longitudinal direction of the arc-extinguishing chamber 4 and is connected to the fixing section 6 of the arc-extinguishing chamber by a connecting member 81 disposed on the back of the fixing support 11, as shown in FIG. Supported,
Further, as shown in FIG.
Is connected to the mounting member 82 provided in the first.

In the present embodiment having the above-described configuration, the insulating member 80 for supporting and fixing the closing resistance contact fixing portion 22 is disposed in parallel with the longitudinal direction of the arc-extinguishing chamber 4. At the time of closing, the movable resistance contact movable electrode 2
3 collides with the closing contact fixed electrode 25, the insulating member 80
Is the load in the compression direction. Therefore, in the insulating member 80 of the present embodiment, since the generation of a force in the bending direction, which has been a problem in the related art, can be prevented, mechanical reliability is increased, and it is not necessary to increase the strength of the insulating member.

Since the insulating member 80 is arranged in parallel with the longitudinal direction of the arc-extinguishing chamber 4, it is necessary to increase the withstand voltage performance of the insulating member 80, that is, the insulating member 80.
It is not necessary to change the length between the closing resistance contact fixing portion 22 and the arc-extinguishing chamber fixing portion 6 even when it is necessary to increase the length. As a result, the space in the container can be used more effectively than when the insulating member is arranged at right angles to the longitudinal direction of the arc-extinguishing chamber 4.

[5. Fifth Embodiment] This embodiment is different from the first embodiment in that the arrangement of the insulating members shown in the fourth embodiment is the same as that of the first embodiment.
This is applied to the embodiment. In the present embodiment, as shown in FIG. 11, the closing resistance contact fixing section 22 is insulated and supported by the fixing section 6 of the arc-extinguishing chamber via an insulating member 80. That is, the insulating member 80 is arranged in parallel to the longitudinal direction of the arc-extinguishing chamber 4, and is connected to the fixing section 6 of the arc-extinguishing chamber by a connecting member 81 arranged on the back of the fixing support 11 as shown in FIG. 13, and connected to a mounting member 82 provided on the closing resistance contact fixing portion 22 as shown in FIG.

On the other hand, the insulating cylinder 50 that insulates and supports the movable part 7 and the fixed part 6 of the arc-extinguishing chamber has one end, that is,
The hole 51 is configured to extend to a portion where the fixing portion 6 is connected to the fixing support 11. The insulating tube 5
0 of the fixed support 11 to which the fixing support 11 is attached.
As shown in FIGS. 12 and 13, a notch 61 is formed in a portion facing the closing resistance contact fixing portion 22 in accordance with the shape of the arc-extinguishing chamber fixing side mounting portion of the insulating tube 50. .

In the present embodiment having the above-described configuration, the same operation and effect as those in the first and fourth embodiments can be obtained. That is, the closing resistance contact fixing unit 2
2 can be arranged close to the fixed part 6 of the arc-extinguishing chamber, and when the gas circuit breaker is closed, the closing resistance contact movable electrode 23
When colliding with the closing contact fixed electrode 25, the collision load applied to the insulating member 80 becomes a load in the compression direction. Therefore, in the insulating member 80 of the present embodiment, since the generation of a force in the bending direction, which has been a problem in the related art, can be prevented, mechanical reliability is increased, and it is not necessary to increase the strength of the insulating member.

Further, since the insulating member 80 is arranged in parallel with the longitudinal direction of the arc-extinguishing chamber 4, when it is necessary to increase the withstand voltage performance of the insulating member 80,
It is not necessary to change the length between the closing resistance contact fixing portion 22 and the arc-extinguishing chamber fixing portion 6 even when it is necessary to increase the length. As a result, the space in the container can be used more effectively than when the insulating member is arranged at right angles to the longitudinal direction of the arc-extinguishing chamber 4.

[6. Sixth Embodiment] This embodiment is different from the third embodiment in that the arrangement of the insulating members shown in the fourth embodiment is the same as that of the third embodiment.
This is applied to the embodiment. In this embodiment, as shown in FIG. 14, the closing resistance contact fixing portion 22 is insulated and supported by the fixing portion 6 of the arc-extinguishing chamber via an insulating member 80. That is, the insulating member 80 is arranged in parallel to the longitudinal direction of the arc-extinguishing chamber 4, and is connected to the fixing section 6 of the arc-extinguishing chamber by a connecting member 81 disposed at the back of the fixing support 11 as shown in FIG. 16, and connected to a mounting member 82 provided on the closing resistance contact fixing portion 22 as shown in FIG.

On the other hand, the insulating cylinder 50 for insulatingly supporting the movable part 7 and the fixed part 6 of the arc-extinguishing chamber has one end, that is,
The hole 51 is configured to extend to a portion where the fixing portion 6 is connected to the fixing support 11. In this embodiment, as shown in FIGS. 15 and 16, a part of the fixing part 6 of the arc-extinguishing chamber is cut off, and furthermore, the fixing finger 8 and the fixed-side shield 10 are inserted. A portion facing the resistance contact fixing portion 22 is also cut out in a similar manner.

In the present embodiment having the above-described configuration, the same operation and effect as those in the third and fourth embodiments can be obtained. That is, as shown in FIG. 16, since the closing resistance contact fixing portion 22 can be arranged closer to the fixing portion 6 of the arc-extinguishing chamber, the inner diameter of the container can be further reduced.

Also, when the closing resistance contact movable electrode 23 collides with the closing contact fixed electrode 25 when the gas circuit breaker is closed,
The collision load applied to the insulating member 80 becomes a load in the compression direction. Therefore, in the insulating member 80 of the present embodiment, since the generation of a force in the bending direction, which has been a problem in the related art, can be prevented, mechanical reliability is increased, and it is not necessary to increase the strength of the insulating member.

Further, since the insulating member 80 is arranged parallel to the longitudinal direction of the arc-extinguishing chamber 4, it is necessary to increase the withstand voltage performance of the insulating member 80, that is, the insulating member 8.
Even when it is necessary to increase the length of 0, there is no need to change the length between the closing resistance contact fixing portion 22 and the fixing portion 6 of the arc-extinguishing chamber. As a result, the space in the container can be used more effectively than when the insulating member is arranged at right angles to the longitudinal direction of the arc-extinguishing chamber 4.

[7. Other Embodiments] The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the insulating cylinder may be configured as shown in the second embodiment, and may be combined with the fourth embodiment. Further, the second embodiment, the third embodiment, and the fourth embodiment can be combined.

[0055]

As described above, according to the present invention, a puffer type with a closing resistance, which has high electrical and mechanical reliability and enables the circuit breaker to be downsized, particularly the inner diameter of the container can be reduced. A gas circuit breaker can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a first embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 2 is a perspective view showing a configuration of an insulating cylinder used in the first embodiment of the present invention.

FIG. 3 is an arrow view showing a configuration of a fixed portion of the arc-extinguishing chamber and a fixed portion of a closing resistance contact according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a configuration of a second embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 5 is a perspective view showing a configuration of an insulating cylinder used in a second embodiment of the present invention.

FIG. 6 is a sectional view showing a configuration of a third embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 7 is a view showing the configuration of a fixed portion of an arc-extinguishing chamber and a fixed portion of a closing resistance contact according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing a configuration of a fourth embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 9 is an arrow view showing a configuration of a fixed portion of an arc-extinguishing chamber and a fixed portion of a closing resistance contact according to a fourth embodiment of the present invention.

FIG. 10 is an arrow view showing a configuration of an arc-extinguishing chamber fixing portion and a closing resistance contact fixing portion according to a fourth embodiment of the present invention.

FIG. 11 is a sectional view showing a configuration of a fifth embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 12 is an arrow view showing a configuration of a fixed part of an arc-extinguishing chamber and a fixed part of a closing resistance contact according to a fifth embodiment of the present invention.

FIG. 13 is an arrow view showing a configuration of a fixing part of an arc-extinguishing chamber and a fixing part of a closing resistance contact according to a fifth embodiment of the present invention.

FIG. 14 is a sectional view showing a configuration of a sixth embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 15 is an arrow view showing a configuration of an arc-extinguishing chamber fixing portion and a closing resistance contact fixing portion according to a sixth embodiment of the present invention.

FIG. 16 is an arrow view showing a configuration of an arc-extinguishing chamber fixing portion and a closing resistance contact fixing portion according to a sixth embodiment of the present invention.

FIG. 17 is a cross-sectional view showing the configuration of a conventional puffer type gas circuit breaker with a two-point cut-off resistance.

FIG. 18 is a cross-sectional view showing a configuration of a conventional puffer type gas circuit breaker with one-point cut-off resistance.

FIG. 19 is an arrow view showing a configuration of a fixing part of an arc-extinguishing chamber and a fixing part of a closing resistance contact in a conventional puffer type gas circuit breaker with a one-point cut-off resistance.

FIG. 20 is a perspective view showing a configuration of a conventional insulating cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 1a ... Flange 2 ... Interruption part 3 ... Support member 4 ... Arc extinguishing chamber 5 ... Making resistance contact part 6 ... Fixed part 7 ... Movable part 8 ... Fixed finger 9 ... Fixed arc electrode 10 ... Fixed side shield 11 ... Fixed Support 12 ... movable electrode 13 ... movable arc electrode 14 ... insulating nozzle 15 ... operating rod 16 ... puffer cylinder 17 ... supporting insulating cylinder 18 ... supporting insulating cylinder shield 19 ... movable support 20 ... puffer piston 21, 50, 70 ... insulating Cylinder 22: closing resistance contact fixing part 23: closing resistance contact movable electrode 24 ... insulating member 25: closing resistance contact fixing part 26 ... spring 27 ... closing resistance 28 ... conductor 29 ... insulating operation rod 30 ... mechanism box 30a ... partition wall 31 ... Sliding member 32 ... Sliding member 35 ... Connecting member 36 ... Mounting resistance contact fixing part attaching part 40 ... Arm part 41,51,71 ... Hole 60 ... Insulating cylinder With 61 ... notch

Claims (4)

[Claims] 1. An arc-extinguishing chamber housed in a container filled with an insulating gas and insulated and supported by the container, and electrically connected in parallel with the arc-extinguishing chamber to suppress overvoltage at the time of injection. A closing resistance, and a closing resistance contact portion electrically connected in series with the closing resistance. The arc-extinguishing chamber includes an arc-extinguishing chamber fixed section and an arc-extinguishing chamber movable section. The part and the arc-extinguishing chamber movable part are supported by an insulating cylinder, and the making-resistance contact part is insulated and supported by the arc-extinguishing chamber via an insulating member. A hole reaching one end is formed on the arrangement side of the closing resistance contact portion, and an insulating cylinder mounting portion of the arc-extinguishing chamber fixing portion to which the insulating cylinder is fixed is provided at an end of the insulating cylinder. Puffer with closing resistance characterized by being configured to match the shape Gas circuit breaker. 2. The puffer-type gas shut-off device with a closing resistor according to claim 1, wherein the insulating tube has a hole extending to both ends on a side where the closing resistor contact portion is provided. vessel. 3. The puffer type with closing resistance according to claim 1, wherein the arc-extinguishing chamber fixing portion is configured to conform to a shape of an end of the insulating cylinder. Gas circuit breaker. 4. The arc-extinguishing chamber according to claim 1, wherein an insulating member for supporting said closing resistance contact portion on said arc-extinguishing chamber fixing portion is arranged in parallel with a longitudinal direction of said arc-extinguishing chamber.
A puffer-type gas circuit breaker with a closing resistance according to any one of the above.